Re: [Xen-devel] [PATCH 1/3] Nested VMX: update nested paging mode when vmswitch is in progress

["Dong, Eddie" <eddie.dong@xxxxxxxxx>]

Acked by Eddie Dong <eddie.dong@xxxxxxxxx>

-----Original Message-----
From: Zhang, Yang Z 
Sent: Thursday, December 12, 2013 10:07 AM
To: xen-devel@xxxxxxxxxxxxx
Cc: JBeulich@xxxxxxxx; Dong, Eddie; Zhang, Yang Z
Subject: [PATCH 1/3] Nested VMX: update nested paging mode when vmswitch is in 
progress

From: Yang Zhang <yang.z.zhang@xxxxxxxxx>

virtual vmentry will change paging related stucture, so corrensponding
nested mode need to be updated which is missing currently.

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

This patch fixed RHEL6 guest installation problem with L1 hyper-v.

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 69f7e74..1f62e00 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1925,7 +1925,7 @@ int hvm_set_cr0(unsigned long value)
     hvm_update_cr(v, 0, value);
 
     if ( (value ^ old_value) & X86_CR0_PG ) {
-        if ( !nestedhvm_vmswitch_in_progress(v) && 
nestedhvm_vcpu_in_guestmode(v) )
+        if ( nestedhvm_vcpu_in_guestmode(v) )
             paging_update_nestedmode(v);
         else
             paging_update_paging_modes(v);
@@ -2014,7 +2014,7 @@ int hvm_set_cr4(unsigned long value)
           (X86_CR4_PSE | X86_CR4_PGE | X86_CR4_PAE | X86_CR4_SMEP)) ||
          (!(value & X86_CR4_PCIDE) && (old_cr & X86_CR4_PCIDE)) )
     {
-        if ( !nestedhvm_vmswitch_in_progress(v) && 
nestedhvm_vcpu_in_guestmode(v) )
+        if ( nestedhvm_vcpu_in_guestmode(v) )
             paging_update_nestedmode(v);
         else
             paging_update_paging_modes(v);
-- 
1.7.1


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